/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.nexmark.queries.sql;



import com.bff.gaia.unified.sdk.extensions.sql.SqlTransform;

import com.bff.gaia.unified.sdk.nexmark.model.Bid;

import com.bff.gaia.unified.sdk.nexmark.model.Event;

import com.bff.gaia.unified.sdk.nexmark.model.sql.SelectEvent;

import com.bff.gaia.unified.sdk.nexmark.queries.NexmarkQueryTransform;

import com.bff.gaia.unified.sdk.nexmark.queries.NexmarkQueryUtil;

import com.bff.gaia.unified.sdk.schemas.transforms.Convert;

import com.bff.gaia.unified.sdk.transforms.Filter;

import com.bff.gaia.unified.sdk.transforms.PTransform;

import com.bff.gaia.unified.sdk.transforms.SerializableFunction;

import com.bff.gaia.unified.sdk.values.PCollection;

import com.bff.gaia.unified.sdk.values.PInput;

import com.bff.gaia.unified.sdk.values.Row;



/**

 * Query 1, 'Currency Conversion'. Convert each bid value from dollars to euros. In CQL syntax:

 *

 * <pre>

 * SELECT Istream(auction, DOLTOEUR(price), bidder, datetime)

 * FROM bid [ROWS UNBOUNDED];

 * </pre>

 *

 * <p>To make things more interesting, allow the 'currency conversion' to be arbitrarily slowed

 * down.

 */

public class SqlQuery1 extends NexmarkQueryTransform<Bid> {



  private static final PTransform<PInput, PCollection<Row>> QUERY =

      SqlTransform.query(

              "SELECT auction, bidder, DolToEur(price) as price, dateTime, extra FROM PCOLLECTION")

          .registerUdf("DolToEur", new DolToEur());



  /** Dollar to Euro conversion. */

  public static class DolToEur implements SerializableFunction<Long, Long> {

    @Override

    public Long apply(Long price) {

      return (price * 89) / 100;

    }

  }



  public SqlQuery1() {

    super("SqlQuery1");

  }



  @Override

  public PCollection<Bid> expand(PCollection<Event> allEvents) {

    return allEvents

        .apply(Filter.by(NexmarkQueryUtil.IS_BID))

        .apply(getName() + ".SelectEvent", new SelectEvent(Event.Type.BID))

        .apply(QUERY)

        .apply(Convert.fromRows(Bid.class));

  }

}